Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020)

Grooved/flat/long
line

Extruded

5.8

T1 or T2

Retracing on
thermoplastic

Spray

1.5

Preformed
thermoplastic
markings,
flat/transverse
symbols and tape

Rolled into hot
asphalt, adhesive
backed and heat
fused (if approved
by the Engineer)

1.5

– 1.6

1.5

– 1.6

Pavement marking material yield depending on thickness shall not exceed the following:

Table 8-18: Application rates for Type T1 & Type T2 thermoplastic material

Thickness

(mm)

Liquid material yield (maximum)

Solid material yield (maximum)

Metres of 100

mm line/litre

/litre

Metres of 100

mm line/23 kg

bag

/23 kg

bag

1.5 flat

6.67

0.67

46.6

4.7

2.3 flat

4.37

0.44

37.0

3.7

2.3 with profiles

2.44

0.24

20.7

2.1

3.0 flat

3.28

0.33

27.8

2.9

3.0 with profiles

1.35

0.13

17.9

1.8

3.2 flat

3.15

0.31

26.5

2.7

4.1 embossed

2.46

0.25

22.9

2.3

4.1 embossed
with profiles

0.53

0.05

4.9

0.5

5.8 grooved

1.71

0.17

14.5

1.4

g. Application of Methyl Methacrylate

Methyl methacrylate (MMA) pavement marking material exists as a solid that is mixed in a static
mixer immediately prior to application and shall be sprayed or extruded onto the pavement.

MMA material consists of a two-part mixture of methyl methacrylate and a catalyst that is applied
cold to the pavement. Material can be applied at a continuously uniform thickness or it can be applied
with profiles (bumps). The material is classified by type designation, depending upon the method of
application.

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Type M2

Spray

Prior to MMA application

Type M3

Machine
extrusion

Prior to MMA application

Immediately after MMA application

Type M4

Machine
extrusion

Prior to MMA application

Immediately after MMA application

Type M5

Spray

Prior to MMA application

Immediately after MMA application

Glass beads, intermixed and surface dress, shall conform to the manufacturer’s recommendations
as necessary to meet the reflectance requirements of Article 8.2.2.6 of these Specifications.

A manufacturer’s technical representative shall be present at the initial installation of MMA material
to supervise the installation procedure if so requested by the Engineer. Application shall be done in
accordance with the manufacturer’s recommended procedure.

1. Preparation of Roadway Surface

The Contractor shall meet the general requirements of Article 8.2.3.1. In addition:

i. Pavement surface temperature shall not exceed 82

C. Requirement may be superseded

by manufacturer’s written installation instructions.

ii. Pavement shall be free from existing pavement marking materials. Refer to Article 8.2.3.7

for methods.

iii. Prior to application, complete pavement cure period of 21 days for bituminous asphalt. Prior

to application, complete pavement cure period of 28 days for Portland cement concrete.
These cure periods may be reduced if the Contractor performs a successful bond test and
the manufacturer approves the reduction of the pavement cure period.

2. Application Thickness

Pavement markings shall be installed at the following base line thicknesses measured above
the pavement surface or above the groove bottom for grooved markings:

Table 8-20: Minimum thickness for MMA pavement markings

Type

Use

Method

Minimum base line thickness (mm)

On HMA/PCC

On BST

Flat/transverse & symbols

Spray

3.0

Flat/transverse & symbols

Extruded

3.0

Flat/long line

Spray

2.3

3.0

Flat/long line

Extruded

2.3

3.0

Profiled/long line

Extruded

2.3

3.0

Grooved/flat/long line

Extruded

5.8

Pavement marking material yield depending on thickness shall not exceed the following:

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/litre

Metres of 100 mm

line/23 kg bag

/23 kg bag

2.3 flat

4.37

0.44

37.0

3.7

2.3 with profiles

2.44

0.24

20.7

2.1

3.0 flat

3.28

0.33

27.8

2.9

3.0 with profiles

1.35

0.13

17.9

1.8

5.8 grooved

1.71

0.17

14.5

1.4

Glass beads shall be applied immediately to the uncured MMA material, as part of the striping
process.

h. Application of Epoxy

Heat the components A and B separately at 43 ±17º C and mix. Apply epoxy markings at 43 ±17º C
(gun tip temperature). Discard all material heated over 60º C.

A manufacturer’s technical representative shall supervise the initial installation of plastic material if
so directed by the Engineer.

Applications shall be done in accordance with the manufacturer’s

recommendations.

Types of epoxy markings shall be defined by the following application methods:

1. Type E1: Immediately apply type 1 glass beads on the epoxy

2. Type E2: Immediately apply type 2 glass beads on the epoxy, immediately followed by an

application of type 1 glass beads.

If the epoxy does not dry within the manufacturer’s recommended drying time, the components likely
did not react properly and will not cure. In this case, the markings shall be removed per Article 8.2.3.7
and the road restriped.

1. Preparation of Roadway Surface

The Contractor shall meet the general requirements of Article 8.2.3.1. In addition:

i. Pavement surface temperature shall not exceed 82

C. Requirement may be superseded

by manufacturer’s written installation instructions.

ii. Pavement shall be free from existing pavement marking materials. Refer to Article 8.2.3.7

for applicable methods.

iii. Epoxies may be applied when pavement surfaces are slightly wet.

iv. Prior to application, complete pavement cure period of 21 days for bituminous asphalt.

v. Prior to application, complete pavement cure period of 28 days for Portland cement

concrete.

2. Application Thickness and Application Rates

Minimum dry film thickness of epoxy material shall be 0.38 mm, and maximum rate of
application shall be 2.6 m2/litre. Glass beads for reflectorized pavement markings shall be
applied as follows:

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none

Type E2

1.4

i. Application of Polyester

A manufacturer’s technical representative shall supervise the initial installation of plastic material if
so directed by the Engineer.

Application shall be done in accordance with the manufacturer’s

recommended procedure.

Spray at 53 ±4º C (gun tip temperature). Discard all material heated over 66º C. Fast dry polyester
markings shall not be used on asphalt pavements less than 1-year-old.

Types of polyester markings shall be defined by the following application methods:

1. Type P1: Immediately apply type 1 glass beads on the polyester

2. Type P2: Immediately apply type 2 glass beads on the polyester, immediately followed by an

application of type 1 glass beads.

1. Preparation of Roadway Surface

The contractor shall meet the general requirements of Article 8.2.3.1. In addition:

i. Pavement surface temperature shall not exceed 82

C. Requirement may be superseded

by manufacturer’s written installation instructions if approved by the Engineer.

ii. Pavement shall be free from existing pavement marking materials. Refer to Article 8.2.3.7

for applicable methods.

2. Application Thickness and Application Rates

Minimum dry film thickness of polyester material shall be 0.38 mm, and maximum rate of
application shall be 2.6 m

/litre. Glass beads for reflectorized pavement markings shall be

applied as follows:

Table 8-23: Minimum application rates for glass beads on polyester

Type

Minimum application rate (kg per litre of polyester)

Type 1 glass beads

Type 2 glass beads

Type P1

1.8

none

Type P2

1.4

j. Application of Preformed Plastic Tape and Symbols

Unless otherwise shown on the Contract plans, permanent preformed pavement markings shall only
be used for symbols, transverse markings (e.g. cross-walks) and legends.

A manufacturer’s technical representative shall be present at the initial installation of plastic material
to supervise the installation procedure if so requested by the Engineer. Installation of the plastic
material shall be done in accordance with the manufacturer’s recommended procedure unless
otherwise approved by the Engineer.

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for applicable methods.

2. Application Thickness

Preformed plastic tape and symbols for transverse markings, legends and symbols shall be
2.3 mm thick for application on HMA or PCCP.

k. Marking Colours

Colours used for pavement marking shall be as indicated on the Contract plans. If not indicated on
the Contract plans, then the colour shall be white, unless otherwise directed by the Engineer.

l. Patterns

Line patterns for pavement marking shall be as indicated on the Contract plans or as directed by the
Engineer.

m. Line and Symbol Surfaces

Line and symbol surfaces shall be as indicated on the Contract plans. Acceptable types are:

1. Flat Line

– Consists of a line or symbol with a flat surface.

2. Profiled Marking

– Consists of a base line thickness and a profiled thickness which is a portion

of  the  pavement  marking  line  that  is  applied  at  a  greater  thickness  than  the  base  line
thickness. Profiles shall be applied using the extruded method in the same application as the
base  line.  The  profiles  may  be  slightly  rounded  provided  the  minimum  profile  thickness  is
provided for the length of the profile.

3. Embossed plastic line

– Consists of a flat line with transverse grooves. An embossed plastic

line may also have profiles.

8.2.3.4

Tolerances

Place markings in accordance with the colour, length width, shape, and configuration shown in the
Contract plans. Pavement markings outside the stated tolerances shall be removed per Article
8.2.3.7 and reinstated or corrected at the expense of the Contractor.

Allowable tolerances are as follows:

1. Alignment of the edges of longitudinal lines shall be reasonably straight and shall not deviate

from the alignment shown in the Contract plans or as directed by the Engineer by more than
50 mm in 100 m.

2. Longitudinal lines shall be offset at least 100 mm from construction joints unless directed

otherwise by the Engineer.

3. Position of lines, letters, figures, arrows, and other markings shall not deviate from the

position shown on the Contract plans or directed by the Engineer by more than 100 mm in
the longitudinal and 20 mm in the transverse direction.

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100 to 115 mm

150 mm

150 to 170 mm

200 mm

200 to 225 mm

Over 200 mm

+25 mm

6. Lane width, which is defined as the lateral width from the edge of pavement to the centre of

the lane line or between the centres of successive lane lines, shall not vary from the widths
shown in the Contract by more than plus or minus 100 mm.

7. Pavement markings shall not be less than the specified thickness. A thickness tolerance not

exceeding plus 10 % will be allowed for thickness or yield in paint and plastic material
application.

8. Gap tolerance between parallel lines is 12 mm.

9. Length of segments of broken longitudinal lines shall not deviate by more than 150 mm from

the specified length.

8.2.3.5

Criteria for Acceptance of New Striping Installations

Striping shall meet the tolerance limits defined in Article 8.2.3.4.

Pavement markings shall exhibit uniform retroreflectance that makes the entire surface of the
pavement marking stripe appear to glow, regardless of the observation distance, from immediately
in front of the test vehicle to the effective distance of the headlights on high beam. Evaluate during
hours of darkness when headlights are necessary for roadway visibility and the road surface is free
of moisture. Vehicle shall travel in the proper lane and direction of travel, parallel to the pavement
marking stripe to be observed, aligned so that the front fender intersects the driver’s line of sight to
the stripe.

Pavement markings that exhibit alternating bright, dim, or dark bars or areas across the stripe; dark
or nonreflecting lines or strips parallel to the length of the stripe; or dark and nonreflecting sections,
shall be unacceptable. Contractor shall replace rejected markings at the Contractor

’s expense.

During daytime, 10 or more skip stripes, or approximately 120 m of stripe, shall be distinctly visible
in contrast to the pavement surface when observed in an area relatively free of vertical curvature.

All permanent pavement markings shall perform to the following standards for at least 15 calendar
days after installation. Within 30 days of notification the Contractor shall remove and replace
pavement markings that fail to meet requirements, at the Contractor

’s expense.

1. Markings shall not lift, shift, smear, spread, flow, or tear by traffic action.

2. Markings shall present a neat, uniform appearance that is free of excessive adhesive, ragged

edges, and irregular lines or contours.

3. Markings shall have uniform and distinctive reflectance when inspected in accordance with

this section of the Specifications.

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’s expense. Sand or other material

deposited on the pavement as a result of removing lines and markings shall be removed as the Work
progresses to avoid hazardous conditions.

Contaminants and existing pavement markings shall be removed from surfaces where the pavement
marking is to be applied by approved mechanical means: watering, sand blasting, burning, brooming
or compressed air if required. Contractor shall avoid damaging the pavement surface.

Use of black paint or chemical paint remover to obliterate existing markings will not be permitted,
except where it is ordered by the Engineer as a temporary measure.

All tracking marks, spilled marking material, markings in unauthorized areas, and defective markings,
and all conflicting pavement markings, shall be removed prior to application of new pavement
markings.

8.3

Temporary Pavement Marking

8.3.1

Description

This Specification covers furnishing and installing temporary pavement markings. Temporary
pavement markings shall be provided where noted in the Contract plans and for all lane shifts and
detours resulting from construction activities.

Unless otherwise shown on the Contract plans or required by the Engineer, temporary pavement
markings shall be yellow in color.

Temporary pavement markings shall be provided when permanent markings are eliminated because
of construction operations. Temporary pavement markings shall be maintained in serviceable
condition throughout the project until permanent pavement markings are installed.

Temporary pavement markings that are damaged shall be repaired or replaced immediately.
Temporary markings that are, in the opinion of the Engineer, damaged by traffic, shall be replaced.
Any temporary line marked with tape shall be repaired immediately when it no longer provides the
intended use.

8.3.2

Materials

Materials for temporary markings shall be one of the following as shown on the Contract plans or as
directed by the Engineer:

1. Alkyd Paint

2. Preformed plastic tape

3. Temporary flexible reflective tabs

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Markings shall be precoated with a pressure sensitive adhesive capable of adhering to roadway
surfaces without the use of heat, solvents or other additional adhesives.

When extruded, pavement marking material without adhesive shall be a minimum of 1.1 mm thick.
New material shall be of good appearance, free from cracks, and edges, shall be true, straight, and
unbroken.

8.3.2.3

Preformed Plastic Tape and Symbols - Type 4 (Temporary -
nonremovable)

Type 4 shall be nonremovable preformed retroreflective film on a conformable metallic backing
capable of performing for the duration of a normal construction season.

A reflective layer of glass beads shall be bonded to the top surface. Glass beads shall meet the
criteria in Article 8.2.2.11.

Markings shall be precoated with a pressure sensitive adhesive capable of adhering to roadway
surfaces without the use of heat, solvents or other additional adhesives.

8.3.2.4

Temporary Flexible Reflective Tabs

Temporary flexible reflective tab pavement markers shall consist of an L-shaped marker body with
retroreflective tape on both faces of the vertical section, capable of retroreflecting light from opposite
directions, with an adhesive on the base. Temporary flexible reflective tabs shall be one of the
following types:

1. Type Y

—yellow marker with amber reflective area on both sides

2. Type W

—white marker with white or silver reflective area on both sides

Marker body shall be fabricated from 1.5 mm minimum thickness polyurethane, polyester elastomer,
or other approved material. Vertical leg shall measure 51 to 76 mm high by 100 ±3 mm wide. Base
leg shall measure 25 to 64 mm wide. A pressure sensitive adhesive with minimum dimensions of 3
mm thick by 19 mm wide by 100 mm long shall be factory applied to the marker base and protected
with release paper.

Reflective material shall not exceed 25 mm in width and be the approximate length of the vertical
wall. Reflective material must be protected with an easily removable cover of heat resistant material
capable of withstanding and protecting the reflective material from the application of 204° C asphalt.
Stapling or clipping devices used to retain the protective cover must not protrude through the
reflective material.

Variations in design and dimensions to meet manufacturer's standards shall be permitted with the
approval of the Engineer.

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Using a medium size sedan, run over the tabs with front and rear wheels at a
speed of 56 to 64 kph, four times in each direction.

Remove the reflective surface protective cover and run over the tabs again at
56 to 64 kph four times in each direction.

Acceptance

criteria

Tabs will be considered sufficiently flexible and resistant to deformation if after
the road test all tabs are intact, the reflective material is still adhered to the
vertical wall and exhibits no apparent visual damage, and the top of the vertical
wall is within 30° of the vertical line through the base of the vertical wall. Tabs
must adhere to the pavement such that no tab dislodges.

Minimum coefficient of retroreflection shall be 1.2 mcd/lux/m

at 0.1

observation angle and -4

entrance angle.

Package tabs such that the vertical wall will not take a permanent set in excess of 15° from true
vertical with respect to the base plane.

8.3.2.5

Acrylic Resin

Acrylic resin paint shall be ready-mixed, one-component, 100% acrylic waterborne paint conforming
to the requirements of US Federal Specifications TT-P-1952F or other similar international standard.

8.3.3

Construction Requirements

8.3.3.1

Preliminary Layout

All preliminary layout and marking in preparation for application shall be the responsibility of the
Contractor. Preliminary layout shall be done in accordance with Article 8.2.3.2.

8.3.3.2

Marking Application

Temporary flexible raised pavement markers are required for bituminous surface treatment
operations.

Markings shall be installed so they are visible from a distance of at least 100 m in daylight conditions
and from a distance of at least 50 m in nighttime conditions, illuminated by automobile low-beam
headlight. Determine visibility distances using an automobile traveling on the roadway under dry
conditions.

Temporary pavement markings consisting of paint or tape may be paved over, but temporary raised
pavement markers or removable tape shall be removed prior to paving.

Any temporary pavement markings that are required on the wearing course prior to construction of
permanent pavement markings and are not a part of the permanent markings shall be completely
removed concurrent with or immediately subsequent to the construction of the permanent pavement
markings.

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Type 3 shall be used on finished pavement surfaces where traffic control or channelization through
the construction zone is temporary requiring removal prior to final pavement markings.

Type 4 shall be used in construction zones where removal is unnecessary due to placement of future
paving courses or where pavement will be removed, obliterated or abandoned at the completion of
the project.

Newly applied markings shall be capable of being immediately exposed to traffic without pickup or
distortion by vehicles. Markings shall be weather resistant and through normal traffic wear shall show
no appreciable fading, lifting, shrinkage, tearing, roll back, or other signs of poor adhesion throughout
the useful life of the marking.

Damaged or missing temporary pavement markings shall be replaced immediately at the
Contractor

’s expense.

c. Temporary Flexible Reflective Tabs

Newly applied markings shall be capable of being immediately exposed to traffic without pickup or
distortion by vehicles.

Damaged or missing temporary pavement markings shall be replaced immediately at the
Contractor

’s expense.

8.4

Raised Pavement Markers

8.4.1

Description

Raised pavement markers (RPMs) shall comply with the dimensions and shapes indicated on the
Contract plans and shall be installed at the locations shown on the Contract plans or where
designated by the Engineer.

Longitudinal markings shall be supplemented with RPMs as indicated on the Contract plans.

8.4.2

Materials

8.4.2.1

Packaging and Marking

Shipments shall be packaged in such a manner as to ensure delivery in perfect condition. Damaged
shipments shall be replaced by the Contractor at the Contractor

’s expense. Each package shall be

clearly marked as to the name of the manufacturer, type of marker, colour, quantity enclosed, lot
number, and date of manufacture. All markers on any one project shall be supplied by the same
manufacturer.

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Base of the RPM shall be free from glaze and substances which may reduce its bond to the adhesive.
Base shall be flat, and its deviation from a flat surface shall not exceed 1.3 mm. Type NR RPMs
shall be precast in the form of a single base, convex, spheroid terminating in a rounded or squared
shoulder where the spherical top meets the base. Top radius of curvature shall be between 90 mm
and 150 mm, except that the radius of the 13 mm nearest the edge may be less.

Type NR RPMs shall be produced from any suitable combination of intimately mixed clays, shales,
talcs, flints, feldspars, or other inorganic material which will meet the properties herein required. Type
NR  RPMs  shall  be  of  uniform  composition,  thoroughly  and  evenly  matured.  They  shall  be free  of
defects  that  affect  appearance,  application  or  durability,  including  surface  irregularities,  cracks,
checks, chipping, peeling, spalling, crazing, or other physical damage. Type NR RPMs shall meet
the following requirements:

Table 8-26: Properties of Type NR RPMs

Property

Value

Weight

125 g minimum

Height

16.5-19.8 mm

Diameter

97.8-102.9 mm

Shoulder height

2-3.6 mm

Planeness of base:
Concavity
Convexity

1.27 mm maximum
1.27 mm maximum

Color

White, unless otherwise indicated on the
Contract plans or directed by the Engineer

Glaze thickness

127 mm minimum

Moh

hardness

6 minimum

Directional reflectance (white):
Glazed surface
Body of marker

75
70 minimum

Yellowness index (white):
Glazed surface
Body of marker

0.07 maximum
0.12 maximum

Strength

310.14 kg/cm

minimum

Water absorption

2.0 % by weight maximum

Bond strength

49.21 kg/cm

minimum

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Body color

Intent

Type CR

White (clear)

Red

White or silver-

white

Channelizing traffic-

or edge lines, 2-way

Type YR, CR

Yellow or white

(clear)

Red

Yellow or white

or silver white

Edge lines, 2-way

Type YY

Yellow

Centre lines, 2-way

Type C/-; Y/-

White (clear)

/yellow

Nil

White or silver

white or yellow

Lane lines/edge

lines 1-way

Note that colours used per location shall be as shown on the Contract plans or directed by the
Engineer

Reflective RPMs shall be in the shape of a shallow frustum of a pyramid with dimensions as shown
in Figure 8-1. Alternatively, RPMs shall have dimensions of 115mm x 115mm. Corners and edges
exposed to traffic shall be rounded. Standard stud length allows installation of the RPM on bridge
decks with 50 mm asphaltic concrete overlays. Longer studs may be used with the Engineer

’s written

approval. Slope of the reflective faces shall be 30

from the horizontal. Each reflective surface shall

have a minimum area of 1440 mm

Figure 8-1: Reflective raised pavement marker dimensions

Base of the RPM shall be free of scale, dirt, rust, oil, grease or any other contaminant which may
reduce its bond to the epoxy adhesive. Base shall be flat, and its deviation from a flat surface shall
not exceed 1.3 mm.

Surfaces  other  than  the  base  shall  be  smooth  except  for  the  manufacturer’s  unique  imprint.
Reflective faces  shall  be molded  of  methyl  methacrylate  (MMA)  or  acrylonitrile  butadiene  styrene
(ABS) in the colours specified on the Contract plans, with a thin untempered glass bonded to the
prismatic reflective face.

RPM studs (stems) shall consist of an anti-twist type to help resist displacement where used on high-
speed roadways having traffic speeds of 80 kph or more, as approved by the Engineer

Body core material other than the reflective faces shall be as approved by the Engineer, typically a
mixture of an inert thermosetting compound and filler material.

a. Optical Performance

A sample of five markers shall be tested in accordance with ASTM E1347 except that the test area
shall be 50 mm in diameter and no more than 3 mm of the curved surface shall protrude into the
measuring apparatus.

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This Item will govern for the furnishing and installation of raised pavement markers that contain LED
lights, powered either by external power source and permanent wiring or by internal rechargeable
battery or capacitor with electronics inside the markers that monitor ambient light levels and activate
the LED’s when the light drops below pre-set levels.

b. Materials

Contractor shall provide LED raised pavement markers that meet the requirements of Article 8.4.2.4,
with the following additional requirements for solar powered LEDs:

1. Furnish markers that maintain an adequate charge for a full duty cycle. The markers will

recharge by sunlight, lower level light, and from other light sources such as vehicle
headlights.

2. Provide markers that are backed by a one year warranty (18 months on capacitor powered)

and have a service life up to 7 years.

3. Furnish markers that use photovoltaic LED technology.

4. Furnish markers with a PVC coated aluminium housing material.

5. Provide markers with reflectors that are corner cube, Polycarbonate lens with a colour as

shown on the Contract plans or as directed by the Engineer.

6. Furnish markers that are unidirectional with 2 white or coloured

LED’s built into the marker.

LED type will be 5000 mcd/LED with an output frequency of steady. Colour shall be as shown
on the Contract plans or as directed by the Engineer.

7. Provide markers with visibility of 1,000 m. With activation that is photo sensor.

8. Furnish markers that use NiMH (nickel-metal hydride) batteries or capacitor for electrical

storage. Output on full charge shall be 96 hours.

Provide markers that have a manufacturer’s warranty of 1 year (battery) and a 1.5 year
(capacitor).

10. Furnish markers that are tested ASTM D4280.

Prior to RPM delivery to site and installation, Contractor shall also provide the following for approval
by the Engineer:

1. Written details of the adhesive proposed for fixing the markers to the pavement surface

together with the method of handling, mixing, application and other relevant procedures.

2. Written confirmation from the adhesive manufacturer that it is suitable for long term fixing of

markers to road pavements.

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2. Type II

—Standard setting, high viscosity, epoxy adhesive. This type of adhesive is

recommended for adherence of traffic markers to pavement surfaces when rapid set is not
required. This type shall be used, unless directed otherwise by the Engineer.

3. Type III

—Rapid setting, low viscosity, water resistant, epoxy adhesive. This type of rapid

setting adhesive, due to its low viscosity, is appropriate only for use with embedded traffic
markers. It is more water-resistant than Type I or Type II.

Adhesive for RPM application shall comply with the material requirements of AASHTO M 237, which
details the following for each type:

1. Chemical composition of component A and component B by mass

2. Physical requirements of the individual components

3. Physical requirements for the mixed epoxy (component A mixed with component B)

4. Certificate of compliance requirements

5. Test methods

6. Recommended practice

In lieu of the square base test specimen molds for the slant shear strength test specified in AASHTO
M 237, cylindrical molds in accordance with ASTM C882M

may be used.

Acceptance of each lot will be based on a

manufacturer’s certificate of compliance. Entire lot of both

components may be rejected if samples submitted for test fail to meet any requirements of this
Specification.

a. Packaging and Marking

Components  of  epoxy  adhesive  for  RPMs  shall  be  supplied  in  separate  containers  that  are  non-
reactive  with  the  materials  contained.  Contents  of  each  container  shall  be  such  that  when  the
container contents are combined, a properly proportioned final mixture results.

Containers shall

be identified as “Component A” (contains the epoxy resin) and “Component B”

(contains the curing agent) and shall show the mixing directions. Each container shall be marked
with the name of the manufacturer, the lot or batch number, the date of packaging, and the weight
or volume of the quantity contained.

Every shipment shall include a statement of the proper type of dispensing equipment to be used,
weather conditions during application that are detrimental to material performance, and materials
safety data sheets.

8.4.2.7

Flexible Bituminous Adhesive for Raised Pavement Markers

Flexible bituminous adhesive shall be used only with imbedded stem type markers and shall be a
hot melt thermoplastic bituminous material used for bonding items to pavement. Material shall
conform to the following requirements:

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30 max

Softening Point, C

AASHTO T 53

93.3 min

Rotational thermoset viscosity, mPa·s, #27 spindle, 20
RPM, 204

AASHTO T 316

5000 max

Ductility, 25

C, 5 cm/minute, cm

AASHTO T 51

15 min

Ductility, 4

C, 1 cm/minute, cm

AASHTO D51

5 min

Flexibility, 2.5 cm, -6.7

C, 90

bend, 10 seconds, 0.32

cm × 2.5 cm × 15 cm specimen

ASTM D3111 *

Pass

*Flexibility test is modified by bending specimen through an arc of 90

at a uniform rate in 10

seconds over a 2.5 cm diameter mandrel.

Flexible bituminous adhesive shall develop bond pull-off strength greater than 345 kPa when tested
in accordance with the following procedures:

Materials and apparatus required to perform the test shall be:

1. Commercially available Portland cement mortar block measuring 20 cm x 45 cm x 5 cm with

a compressive strength of 20 to 35 mPa, conditioned for 24 hours at standard laboratory
conditions prior to test.

2. Gyratory compacted asphalt concrete puck measuring 15 cm in diameter conditioned for 24

hours at standard laboratory conditions prior to test.

3. Type NR RPM, drilled in the center to accept a threaded steel rod. RPMs shall be from at

least two different manufacturers with different patterns on the bottom of the markers.

4. Laboratory melter as described in ASTM D5167

5. Drill press with bit sized for the threaded rods described below.

6. Threaded steel eye bolt for attaching to the RPM.

7. Tensile testing apparatus as described in AASHTO T 237 Section 13, fitted with a threaded

steel rod with a 5 cm hook.

Procedure shall be completed as follows:

1. Pull-off tests shall be run in triplicate.

Adhesive shall be heated in the laboratory melter to the manufacturer’s recommended
application temperature.

3. A quantity of adhesive sufficient to squeeze out a small bead around the entire periphery of

a 100 mm RPM shall be poured onto a Portland cement mortar block or asphalt concrete
puck. A predrilled RPM shall be seated on the adhesive and allowed to cure for at least 4
hours.

4. A threaded steel eye bolt shall be inserted into the predrilled hole in the RPM.

5. Block, or puck, and RPM shall be placed in the tensile testing apparatus and the threaded

hook shall be inserted in the eye bolt.

6. Load shall be applied slowly until failure and the maximum load shall be recorded.

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After installation, RPMs shall be firmly bonded to the pavement. Lines formed by the RPMs shall be
true and the entire installation shall present a neat appearance.

8.4.3.1

Surface Preparation

Pavement surface shall be prepared in accordance with Article 8.2.3.1 and as specified below:

a. All sand, dirt and loose extraneous material shall be swept or blown away from the RPM

location and the cleaned surface prepared by one of the following procedures:

1. Pavement surface shall be heated by intense radiant heat (not direct flame) for a sufficient

length of time to char extraneous, organic surface contaminants but not to exceed 1½
minutes.

2. Pavement surface shall be sandblasted for a sufficient length of time to remove all surface

contaminants and unsound particles but not so long as to expose buried aggregate. A
hot air blast shall be used to remove loose sand and dirt from the blasted areas and
ensure that the surface is completely dry.

b. When RPMs are placed on new cement concrete pavement, any curing compound shall be

removed

c. Newly placed asphaltic concrete pavement need not be sandblasted unless, in the opinion of

the Engineer, the surface is contaminated with materials that would adversely affect the bond
of the adhesive.

d. RPMs shall be placed on new asphaltic concrete only after the new surface has aged at least

14 days, unless a longer period is required by the adhesive manufacturer.

e. RPMs shall be installed on dry pavement. RPMs shall not be installed when the relative

humidity is 80 % or higher, or when the pavement is not surface dry.

8.4.3.2

RPM Preparation

RPMs shall be free of rust, scale, dirt, oil, grease, moisture, and contaminants that might adversely
affect the adhesive bond.

S = L/A

S = Pull-off Strength, kpa

L = Maximum Load, kN

A = Surface Area of RPM (m2)

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Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020) - page 34